Команда comm
Select or reject lines common to two files.
comm [-1] [-2] [-3 ] file1 file2
| -1 | Suppress the output column of lines unique to file1. |
| -2 | Suppress the output column of lines unique to file2. |
| -3 | Suppress the output column of lines duplicated in file1 and file2. |
| file1 | Name of the first file to compare. |
| file2 | Name of the second file to compare. |
comm myfile1.txt myfile2.txt
The above example would compare the two files myfile1.txt and myfile2.txt.